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Why Should I Choose a Diesel Powered Engine or Generator

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					                            Why Should I Choose a Diesel Powered Engine or Generator?


                     In today's world, where fuel prices are increasing as a consequence of spiraling demand and
    diminishing supply, you need to choose a cost effective fuel to meet your needs. Thanks to the invention of
    Rudolph Diesel, the diesel engine has proved to be extremely efficient and cost effective. Diesel fuel is priced
    moderately higher than gasoline but diesel has a higher energy density, i.e. more energy can be extracted from
    diesel as compared with the same volume of gasoline. Therefore, diesel engines in automobiles provide higher
    mileage, making it an obvious choice for heavy-duty transportation and equipment. Diesel is heavier and oilier
    compared with gasoline, and has a boiling point higher than that of water. And diesel engines are attracting
    greater attention due to higher efficiency and cost effectiveness.

    How Does a Diesel Engine Work?
    The distinction lies in the type of ignition. While gasoline engines operate on spark ignition, diesel engines employ
    compression - ignition for igniting the fuel. In the latter, air is drawn into the engine and subjected to high
    compression that heats it up. This results in a very high temperature in the engine, much higher than the
    temperature attained in a gasoline engine. At peak temperature and pressure, diesel that is let into the engine
    ignites on account of the extreme temperature.

    In a diesel engine, air and the fuel are infused into the engine at different stages, as opposed to a gas engine
    where a mixture of air and gas are introduced. Fuel is injected into the diesel engine using an injector whereas in
    a gasoline engine, a carburetor is used for this purpose. In a gasoline engine, fuel and air are sent into the engine
    together, and then compressed. The air and fuel mixture limits fuel compression, and hence the overall efficiency.
    A diesel engine compresses only air, and the ratio can be much higher. A diesel engine compresses at the ratio of
    14:1 up to 25:1, whereas in a gasoline engine the compression ratio is between 8:1 and 12:1. After combustion,
    the combustion by-products are removed from the engine through the exhaust. For starting during cold months
    extra heat is provided through 'glow plugs'.

    Diesel engines can either be two cycles or four cycles and are chosen depending on mode of operation. Air-cooled
    and liquid-cooled engines are the variants to be chosen appropriately. It is preferable to use a liquid-cooled
    generator as it is quiet in operation and has evenly controlled temperature.

    Advantages of a Diesel Engine
    The diesel engine is much more efficient and preferable as compared with gasoline engine due to the following
    reasons:


   Modern diesel engines have overcome disadvantages of earlier models of higher noise and maintenance costs.
    They are now quiet and require less maintenance as compared with gas engines of similar size.
   They are more rugged and reliable.
   There is no sparking as the fuel auto-ignites. The absence of spark plugs or spark wires lowers maintenance
    costs.
   Fuel cost per Kilowatt produced is thirty to fifty percent lower than that of gas engines.
   An 1800 rpm water cooled diesel unit operates for 12,000 to 30,000 hours before any major maintenance is
    necessary. An 1800 rpm water cooled gas unit usually operates for 6000-10,000 hours before it needs servicing.
   Gas units burn hotter than diesel units, and hence they have a significantly shorter life compared with diesel units.
Applications & Uses for Diesel Engines
Diesel engines are commonly used as mechanical engines, power generators and in mobile drives. They find wide
spread use in construction equipment, automobiles, and countless industrial applications. Their realm extends to
almost all industries and can be observed on a daily basis if you were to look under the hood of everything you
pass by. Industrial diesel engines and diesel powered generators have construction, marine, mining, hospital,
forestry, telecommunications, underground, and agricultural applications, just to name a few. Power generation
for prime or standby backup power is the major application of today's diesel generators.

Power Generators
Diesel powered generators, or electrical generator sets, are used in countless industrial and commercial
establishments. The generators can be used for small loads, such as in homes, as well as for larger loads like
industrial plants, hospitals, and commercial buildings. They can either be prime power sources or standby/back-up
power sources. They are available in various specifications and sizes. Diesel generator sets rating 5-30KW are
typically used in simple home and personal applications like recreational vehicles. Industrial applications cover a
wider spectrum of power ratings (from 30 kW to 6 Megawatts) and are used in numerous industries throughout
the globe. For home use, single-phase power generators are sufficient. Three-phase power generators are
primarily used for industrial purposes.

				
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posted:4/15/2010
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